R1:d1f76947badc

Remove some unused translation strings

Summary: These strings are no longer required after D6501.

Test Plan: `grep`

Reviewers: btrahan, epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D11105